Limited polysulfone solubility in supercritical dimethyl ether with THF and DMF cosolvents

Li, Dan; McHugh, Mark A.

doi:10.1016/s0896-8446(03)00094-9

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…Controlled precipitation of polymers dissolved in good solvents is a methodology that has been used since the 1960s to prepare synthetic membranes for a variety of purposes from commodity plastics such as polypropylene [PP], − polyamides [PA], , and polycarbonates [PC], , as well as from engineering polymers, e.g., poly(vinylidine difluoride) [PVDF], − polysulfone [PSU], poly(ether sulfone) [PESU], − poly(phenyl sulfone) [PPSU], and poly(phenylene sulfide) [PPS] . The approach first used to establish conditions required for phase separation is nonsolvent induced phase separation (NIPS), , which is based on dissolving a non-cross-linked polymer in one or several good and/or intermediate solvent(s), casting the polymer solution (called a dope) into a thin film, and thereafter altering the solvent properties of the diluent.…”

Section: Introductionmentioning

confidence: 99%

Monolithic Space-Filling Porous Materials from Engineering Plastics by Thermally Induced Phase Separation

Elhaj

Irgum

2014

ACS Appl. Mater. Interfaces

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Six different uncompounded engineering and commodity polymers were evaluated for their ability to produce space-filling monolithic entities by thermally induced phase separation (TIPS) from 22 different solvents. Attempts were first made to dissolve the polymers at elevated temperatures, selected below the boiling point of each solvent. Then the solutions of polymers that were homogeneous dissolved underwent a controlled temperature decrease to induce a phase separation as the upper critical solution temperature was passed. Twelve of the solvents gave monolithic entities by this procedure, materials that were characterized with regard to their specific surface area and pore size distribution. These measured parameters were then correlated with their macroporous morphology, assessed by scanning electron microscopy. Monolithic materials with widely different mesoporous properties were obtained with specific surface areas ranging from 169 m(2)/g to structures with essentially nonporous skeletons and distinct mesopore size distribution modes from 6 to 15 nm. The materials furthermore had a wide variation in their macroporous morphologies-among the same polymer processed in different solvents and between different polymers dissolved in the same solvent. TIPS processing therefore appears to be a viable route to prepare space-filling meso- and macroporous support materials for a wide variety of purposes in separation science and heterogeneous chemistry.

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Section: Introductionmentioning

confidence: 99%

Monolithic Space-Filling Porous Materials from Engineering Plastics by Thermally Induced Phase Separation

Elhaj

Irgum

2014

ACS Appl. Mater. Interfaces

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“…[9][10][11] Previous studies have highlighted the chemical stability of PSU and its poor solubility in supercritical fluids (SCF), butane, dimethyl ether (DME), chlorodifluoromethane and difluoroethane, even at temperatures as high as 200 C and pressures of 2100 bar. 12 Solubility was observed in DME with the addition of 24-65 wt% tetrahydrofuran (THF) or N,N-dimethylformamide (DMF), at room temperature/pressure 12 but such a solvent system is likely to denature biomolecules present in a commixture.…”

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confidence: 99%